Ionia Weather Forecast

    • 51
    • 69

    Increasing Clouds

    • 54
    • 73

    Partly Sunny

    • 64
    • 76

    Mostly Cloudy

    • 65
    • 82

    Chance Rain Showers

    • 54
    • 71

    Slight Chance Rain Showers

    • 53
    • 66

    Mostly Sunny

Today 6 Sep Ontario

Partly to mostly sunny. Highs Ranging from the mid 60s on the Hilltops to the lower 70s across the lower Elevations. North Winds 5 to 10 Mph.

Tonight 6 Sep Ontario

Mainly clear in the Evening, then becoming partly cloudy with some patchy fog developing overnight. Lows in the lower 50s. North Winds 10 Mph or less.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ionia Temperature Statistics

September Temperature

Rochester, Greater Rochester International Airport (15.5 miles)

  • Lowest 4 September, 2026

    63 °F

  • Average September

    74.5 °F

  • Highest 2 September, 2026

    85.6 °F

Climate (2021–2026)

Rochester, Greater Rochester International Airport (15.5 miles)

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  • Average Low 2021–2026

    42.3 °F

  • Average 2021–2026

    50.8 °F

  • Average High 2021–2026

    59.5 °F
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